Unlike the pigs, the Dogs attack you, and you must be quick to launch your Birds and defeat them. Brick forts are still present, but the Dogs, like Ground Dogs, can exit the fort to attack, and Flying Dogs are above the structure. The Brown Bird is good against Flying Dogs, it can bounce it's bomb back to the dog or the structure, giving you a advantage. Yellow and Black Birds are good against Ground and Soldier Dogs, but they can be shot. The Soldier Dog is weaker when refilling it's turrent, use any bird to get it. The Commander Dog boss has him inside a tent inside a stone and ice fortress, use Yellow, Black, and Blue birds to reveal the tent. Then, use any bird to destroy the tent, and the Commander Dog is good to finish off.